Battery production equipment and battery production line

Abstract

The invention provides battery production equipment and a battery production line, the battery production equipment comprises a material belt conveying mechanism, a compounding mechanism, a lamination mechanism and surface treatment equipment, the material belt conveying mechanism is used for supplying and conveying a material belt, the material belt comprises one of an anode unit, a cathode unit and a diaphragm, the compounding mechanism is arranged at the downstream of the material belt conveying mechanism, and the lamination mechanism is arranged on the surface of the material belt conveying mechanism. The compounding mechanism is used for thermally compounding the anode unit and the cathode unit to the surfaces of the two sides of the diaphragm to form a composite material belt, the lamination mechanism is arranged at the downstream of the compounding mechanism to stack the composite material belt, and the surface treatment equipment is arranged at the upstream of the compounding mechanism; and the surface treatment equipment is configured to perform roughening treatment on the surface of the material belt before thermal compounding. According to the battery production equipment and the battery production line in the embodiment of the invention, the surface adhesive force between the diaphragm and the pole piece can be increased, and the compounding effect of the diaphragm and the pole piece is improved while the risks of edge powder falling of the cathode unit and diaphragm hole closing are reduced.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a battery manufacturing equipment and battery production line. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Currently, in the battery manufacturing process, separators and electrodes are laminated using a composite roller under heat and pressure to form stacked batteries. In actual manufacturing, without increasing the roller pressure, poor lamination between the separator and electrodes may occur, leading to wrinkles in the separator and through-crinkles in the resulting cell. However, increasing the roller pressure can easily cause powder to be pressed out of the cell, affecting cell performance. Therefore, improving the lamination effect between the electrodes and separator has become an urgent problem to be solved. Summary of the Invention

[0004] In view of the above problems, this application provides a battery production equipment and battery production line that can increase the surface adhesion between the separator and the electrode, reduce the risk of edge powder shedding of the cathode unit and separator pore blockage, and improve the composite effect of the separator and the electrode.

[0005] In a first aspect, this application provides a battery production apparatus, including a material conveying mechanism, a composite mechanism, a stacking mechanism, and a surface treatment device. The material conveying mechanism is used to supply and convey a material strip, which includes one of an anode unit, a cathode unit, and a separator. The composite mechanism is located downstream of the material conveying mechanism and is used to thermally composite the anode unit and the cathode unit to both sides of the separator to form a composite material strip. The stacking mechanism is located downstream of the composite mechanism to stack the composite material strip. The surface treatment device is located upstream of the composite mechanism and is configured to roughen the surface of the material strip before thermal composite.

[0006] In this embodiment, by setting a surface treatment device upstream of the composite mechanism, the surface of the material strip can be roughened before composite. The adhesion of the treated material strip surface is enhanced, thereby eliminating the need to increase the rolling pressure. While reducing the risk of powder falling off the cathode unit edge and pore blockage of the separator, the composite effect between the material strips is improved, making the material strips fit tightly and improving the performance of the stacked battery.

[0007] In some embodiments, the surface treatment apparatus includes a conveyor roller and a treatment element disposed opposite each other and having a gap formed therebetween. The treatment element is configured to roughen the surface of a strip entering the gap, and the conveyor roller is configured to convey the roughened strip to the side where the composite mechanism is located. The surface treatment apparatus can be integrated into the strip conveying mechanism to cooperate with the strip conveying mechanism via the conveyor roller to achieve strip conveying and reduce conveying pressure. The treatment element is disposed opposite to the conveyor roller to roughen the surface of the strip facing the treatment element, thereby improving the adhesion of the strip surface.

[0008] In some embodiments, the conveyor roller is grounded, and the processing element is a discharge roller, which is disposed opposite to the conveyor roller and has a voltage difference with the conveyor roller to form a corona channel in the gap.

[0009] In this embodiment, a corona system is formed using a conveyor roller and a discharge roller. This allows for corona treatment of the conveyor belt during transport, increasing the surface roughness of the belt and improving the bonding effect between belt sections. Furthermore, the grounding of the conveyor roller reduces the impact of corona treatment on it, improving its reliability.

[0010] In some embodiments, the surface treatment apparatus further includes a base, a discharge roller connected to the base, the base having a degree of freedom of movement toward or away from the conveyor roller, and / or, the discharge roller being movable relative to the base toward or away from the conveyor roller to adjust the distance between the conveyor roller and the discharge roller to achieve a better corona treatment effect.

[0011] In some embodiments, the base includes a plurality of walls defining a receiving cavity with an opening on one side. A discharge roller is disposed within the receiving cavity and is positioned opposite a conveying roller through the opening. The surface treatment apparatus also includes an extraction device connected to the walls and communicating with the receiving cavity. By disposing the discharge roller within the receiving cavity and by communicating the extraction device with the receiving cavity, ozone can be removed using the extraction device, reducing the harm caused by ozone to humans, machinery, and equipment.

[0012] In some embodiments, the axis of the discharge roller is parallel to the axis of the conveyor roller, which can improve the parallelism between the discharge roller and the conveyor roller, thereby making the distance between each area on the conveyor roller and the discharge roller the same along the axial direction of the conveyor roller, so as to improve the uniformity of corona in each area of ​​the material belt, make the distance adjustment easier, and improve the corona effect.

[0013] In some embodiments, the diameter of the conveyor roller is greater than or equal to the diameter of the discharge roller. By increasing the diameter of the conveyor roller, the contact area between the conveyor roller and the material belt is increased while maintaining the same wrap angle, so as to achieve stable and reliable material belt transportation and reduce the bending degree of the material belt during transportation, thereby reducing damage to the material belt during transportation.

[0014] In some embodiments, there are multiple conveyor belts, and at least one conveyor belt is provided with a surface treatment device.

[0015] In this embodiment, the surface treatment equipment may be provided on only one of the anode conveying mechanism, the cathode conveying mechanism, and the diaphragm conveying mechanism, for example, on the diaphragm conveying mechanism, in order to roughen the surface of the diaphragm and improve the composite effect.

[0016] In some embodiments, each conveyor belt is equipped with a surface treatment device, that is, a surface treatment device can be provided on the anode conveyor, cathode conveyor and diaphragm conveyor to simultaneously increase the surface roughness of the anode unit, cathode unit and diaphragm, and further improve the composite effect of the composite conveyor belt.

[0017] In some embodiments, at least one conveyor belt is provided with a plurality of surface treatment devices, which are used to roughen the surfaces on both sides of the conveyor belt.

[0018] In this embodiment, both sides of the diaphragm can be roughened to increase the composite effect between the diaphragm and the anode unit, as well as between the diaphragm and the cathode unit. This further improves the composite effect of the composite strip while reducing the risk of powder shedding from the cathode unit's edges and diaphragm pore blockage.

[0019] In some embodiments, at least two surface treatment devices perform different roughening treatments on the surface of the strip, which can create differences in the peel force of the composite surface between the separator and the anode unit and the composite surface between the separator and the cathode unit after surface treatment. Specifically, the peel force of the composite surface between the separator and the cathode unit is greater than the peel force of the composite surface between the separator and the anode unit, thereby reducing the risk of lithium plating and other problems in the formed stacked battery and improving the performance of the stacked battery.

[0020] In some embodiments, multiple conveyor belts are disposed upstream of the composite mechanism; or, the composite mechanism includes a first sub-composite mechanism and a second sub-composite mechanism disposed at intervals, wherein the conveyor belt for conveying the anode unit and the diaphragm is disposed upstream of the first sub-composite mechanism, and the conveyor belt for conveying the cathode unit is disposed between the first sub-composite mechanism and the second sub-composite mechanism.

[0021] In some embodiments, the processing unit includes a material chamber for containing coating material and an outlet for spraying coating material onto the surface of the conveyor belt.

[0022] In this embodiment, the coating can be a chemical reagent, such as a catalyst or etchant. Compared with mechanical grinding or sandblasting, spraying chemical reagents is safer and more reliable, and does not increase the thickness of the material strip. It is easy to operate and has high reliability.

[0023] Secondly, embodiments of this application provide a battery production line, including the battery production equipment of the first aspect.

[0024] According to an embodiment of this application, a battery production apparatus includes a material conveying mechanism, a bonding mechanism, a stacking mechanism, and a surface treatment device. The material conveying mechanism is used to supply and convey a material strip, which includes one of an anode unit, a cathode unit, and a separator. The bonding mechanism is located downstream of the material conveying mechanism and is used to thermally bond the anode unit and the cathode unit to both sides of the separator. By setting the surface treatment device upstream of the bonding mechanism, the surface of the material strip can be roughened before bonding. The adhesion of the treated material strip surface is enhanced, thereby eliminating the need to increase the rolling pressure. This reduces the risk of edge powder shedding from the cathode unit and separator pores, while improving the bonding effect between the material strips, making the material strips fit tightly together and improving the performance of the stacked battery.

[0025] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of a composite mechanism for pressing a material belt at a certain position, provided in some embodiments of this application;

[0028] Figure 2 This is a schematic diagram of the structure of another location of the composite mechanism roller pressing belt provided in some embodiments of this application;

[0029] Figure 3 This is a schematic diagram of the structure of a battery production equipment provided in some embodiments of this application;

[0030] Figure 4 This is a schematic diagram of the structure of a surface treatment apparatus provided in some embodiments of this application;

[0031] Figure 5 This is a cross-sectional view of a Z-shaped stacked battery provided in some embodiments of this application.

[0032] The reference numerals in the detailed embodiments are as follows:

[0033] 10 Battery production equipment, 20 Material strips, 210 Anode units, 220 Cathode units, 230 Separators;

[0034] 1. Belt conveyor mechanism, 1a. Anode conveyor mechanism, 11a. Anode unwinding device, 12a. Anode cutting device, 1b. Cathode conveyor mechanism, 11b. Cathode unwinding device, 12b. Cathode cutting device, 1c. Diaphragm conveyor mechanism, 2. Composite mechanism, 21. First sub-composite mechanism, 22. Second sub-composite mechanism, 3. Surface treatment equipment, 31. Conveying roller, 32. Processing component, 33. Base, 331. First sidewall, 332. Second sidewall, 333. Bottom wall, 34. Air extraction device;

[0035] A1 edge region. Detailed Implementation

[0036] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0037] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0038] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0039] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0040] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0041] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] As the most representative energy storage device in the new energy field, batteries are increasingly widely used in mobile electronic devices, electric vehicles, and energy storage. Depending on the manufacturing process, batteries can be divided into wound batteries and stacked batteries. Stacked batteries have advantages over wound batteries in terms of higher rate capability and higher energy density, and they can also be manufactured into various irregular shapes to meet different needs. Therefore, stacked batteries are widely used in the industry.

[0043] Taking the manufacturing process of stacked batteries as an example, the manufacturing steps are as follows: First, the anode unit 210, separator 230, and cathode unit 220 are rolled together to form a composite strip. Finally, the composite strip is repeatedly stacked to obtain a stacked battery. The bonding effect of the anode unit 210, separator 230, and cathode unit 220 is related to the rolling pressure. If the rolling pressure is too low, it can easily lead to poor bonding between the separator 230 and the electrode, and the composite strip cannot meet the requirements. This results in wrinkles in the separator 230 and through-wrinkles in the stacked battery after stacking, affecting the cell performance.

[0044] Please see Figure 1 and Figure 2 , Figure 1 and Figure 2Schematic diagrams show the roll-pressing process performed at different locations on the cathode unit 220 and the separator 230. Because the edge of the anode unit 210 protrudes beyond the edge of the cathode unit 220, stress concentrates at the edge of the cathode unit 220 when the roll-pressing process is applied to the cathode unit 220 and the separator 230, particularly at the edge region A1. Therefore, if the roll-pressing pressure is too high, it can cause filamentous powder to fall off the edge of the cathode unit 220, and in severe cases, it can close the pores in the separator 230 corresponding to the edge of the cathode unit 220, affecting the cell performance.

[0045] Based on the above considerations, in order to increase the composite effect between the electrode and the separator 230, this application provides a battery production equipment 10 and a battery production line. By performing surface treatment on the composite surface between the electrode and the separator 230 before roll forming, the surface adhesion is improved, thereby improving the composite effect between the electrode and the separator 230 after forming without increasing the roll forming pressure.

[0046] According to some embodiments of this application, please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery production equipment 10 provided in some embodiments of this application. This application provides a battery production equipment 10, including a material conveying mechanism 1, a composite mechanism 2, a stacking mechanism, and a surface treatment device 3. The material conveying mechanism 1 is used to supply and convey a material strip 20, which includes one of an anode unit 210, a cathode unit 220, and a separator 230. The composite mechanism 2 is located downstream of the material conveying mechanism 1 and is used to thermally composite the anode unit 210 and the cathode unit 220 to both sides of the separator 230 to form a composite material strip. The stacking mechanism is located downstream of the composite mechanism 2 to stack the composite material strip. The surface treatment device 3 is located upstream of the composite mechanism 2 and is configured to roughen the surface of the material strip 20 before thermal composite.

[0047] It should be noted that the terms "upstream" and "downstream" mentioned above and below in this invention refer to the order of production of stacked batteries, and do not limit the spatial position between the components.

[0048] The material conveying mechanism 1 is used to supply and convey the material belt 20. In specific implementation, there are two or more material conveying mechanisms 1, which are used to supply and convey the anode unit 210, the cathode unit 220 and the diaphragm 230 respectively.

[0049] For ease of description, the material conveying mechanism 1 used to convey the anode unit 210 is defined as the anode conveying mechanism 1a, the material conveying mechanism 1 used to convey the cathode unit 220 is defined as the cathode conveying mechanism 1b, and the material conveying belt 20 used to convey the diaphragm 230 is defined as the diaphragm conveying mechanism 1c.

[0050] The anode conveying mechanism 1a includes an anode unwinding device 11a and an anode cutting device 12a. The anode unwinding device 11a can release the anode sheet and specifically includes an anode unwinding roller and a drive component that drives the unwinding roller to rotate. The anode sheet is released by the rotation of the anode unwinding roller. The anode cutting device 12a is located downstream of the anode unwinding device 11a. The anode cutting device 12a can receive the anode sheet and cut the anode sheet into multiple anode units 210.

[0051] The cathode conveying mechanism 1b includes a cathode unwinding device 11b and a cathode cutting device 12b. The cathode unwinding device 11b can release the cathode sheet. Specifically, it can include a cathode unwinding roller and a drive component that drives the unwinding roller to rotate. The cathode sheet is released by the rotation of the cathode unwinding roller. The cathode cutting device 12b is located downstream of the cathode unwinding device 11b. The cathode cutting device 12b can receive the cathode sheet and cut the cathode sheet into multiple cathode units 220.

[0052] The diaphragm conveying mechanism 1c includes a diaphragm 230 unwinding device, which may specifically include a diaphragm 230 unwinding roller and a drive component that drives the unwinding roller to rotate. The diaphragm 230 is released by the rotation of the diaphragm 230 unwinding roller.

[0053] The composite mechanism 2 is used to roll the fed anode unit 210 and cathode unit 220 together with the diaphragm 230, so that the anode unit 210 and cathode unit 220 are combined onto both sides of the diaphragm 230, and the diaphragm 230 separates the anode unit 210 and cathode unit 220.

[0054] Surface treatment equipment 3 is used to roughen the surface of the strip 20 before lamination. This is done by creating small depressions, pits, or protrusions on the surface of the strip 20 to alter its shape, thereby increasing the surface area available for lamination and improving the bonding strength between the strips 20. Surface treatment equipment 3 can employ various principles, such as chemical etching, laser etching, or corona treatment.

[0055] The battery production equipment 10 in this embodiment of the application can roughen the surface of the material strip 20 before lamination by setting a surface treatment device 3 upstream of the lamination mechanism 2. The adhesion of the treated material strip 20 surface is enhanced, so there is no need to increase the rolling pressure. While reducing the risk of powder falling off the edge of the cathode unit 220 and the pore blockage of the separator 230, the lamination effect between the material strips 20 is improved, making the material strips 20 fit tightly and improving the performance of the stacked battery.

[0056] According to some embodiments of this application, the surface treatment apparatus 3 includes a conveying roller 31 and a processing member 32 that are arranged opposite to each other and have a gap. The processing member 32 is configured to roughen the surface of the material strip 20 that enters the gap, and the conveying roller 31 is configured to convey the roughened material strip 20 to the side where the composite mechanism 2 is located.

[0057] The surface treatment device 3 can be integrated into the belt conveyor mechanism 1 to cooperate with the belt conveyor mechanism 1 in conveying the belt 20 via the conveyor roller 31, thereby reducing conveying pressure. The treatment component 32 is arranged opposite to the conveyor roller 31 to roughen the surface of the belt 20 facing the treatment component 32, thereby improving the adhesion of the belt 20 surface. Optionally, the surface treatment device 3 also includes a drive component that drives the conveyor roller 31 to rotate, thereby achieving the conveying of the belt 20 together with the belt conveyor mechanism 1 through the rotation of the conveyor roller 31.

[0058] Specifically, in this embodiment, the processing component 32 can be adjusted according to the principle adopted by the surface treatment equipment 3.

[0059] When the surface treatment equipment 3 uses chemical etching to roughen the surface of the strip 20, in some alternative embodiments, the treatment element 32 includes a material chamber for containing coating material and an outlet for communicating with the material chamber and being configured to spray coating material onto the surface of the strip 20.

[0060] The material chamber refers to a cavity capable of containing or storing paint. It can be a cavity of any shape or volume, as long as it can supply paint to the output port. The output port is positioned opposite to the conveyor roller 31 and is used to spray paint onto the surface of the material belt 20.

[0061] Alternatively, the coating can be a chemical reagent, such as a catalyst or etchant. Compared with mechanical grinding or sandblasting, spraying with chemical reagents is safer and more reliable, and does not increase the thickness of the strip 20. It is easy to operate and has high reliability.

[0062] When the surface treatment equipment 3 uses corona treatment to roughen the surface of the strip 20, in some alternative embodiments, the conveyor roller 31 is grounded and the treatment element 32 is configured as a discharge roller, which is disposed opposite to the conveyor roller and has a voltage difference with the conveyor roller 31 to form a corona channel in the gap.

[0063] The principle of corona treatment is to use high-frequency, high-voltage current to generate corona between the discharge roller and the conveyor roller 31 by connecting a high-voltage cable to the discharge roller. This forms a low-temperature plasma, and the air between the discharge roller and the conveyor roller 31 is ionized to produce ozone. Ozone is an oxidant that can immediately change the molecular structure of the plastic surface, converting it from non-polar to polar. Therefore, after corona treatment, tiny, uneven pores appear on the surface of the material strip 20, making the surface of the material strip 20 rough and improving adhesion.

[0064] By utilizing the conveyor roller 31 and the discharge roller to form a corona system, the conveyor belt 20 can be corona-treated during the conveying process, thereby increasing the surface roughness of the conveyor belt 20 and improving the composite effect between the conveyor belts 20. Furthermore, since the conveyor roller 31 is grounded, the impact of corona on the conveyor roller 31 can be reduced, improving the reliability of the conveyor roller 31.

[0065] Optionally, the conveyor roller 31 can be coated or sleeved with rubber to increase the friction between the conveyor belt 20 and the conveyor roller 31, reduce slippage, further reduce the impact of corona discharge on the conveyor roller 31, and improve the reliability of the conveyor belt 20. The discharge roller can be a ceramic roller, which has good stability.

[0066] Optionally, the distance d1 between the conveyor roller 31 and the discharge roller can be set to 1mm to 5mm. By making the distance d1 between the conveyor roller 31 and the discharge roller greater than 1mm, the distance between the conveyor roller 31 and the discharge roller is prevented from being too close, thereby reducing the risk of damage to the material strip 20 due to a large current. Furthermore, by making the distance d1 between the conveyor roller 31 and the discharge roller less than 5mm, the distance between the conveyor roller 31 and the discharge roller is prevented from being too far, thereby reducing the risk of electric sparks being generated between the conveyor roller 31 and the discharge roller, and improving the reliability of the material strip 20 processing.

[0067] Understandably, the input power of the processing unit 32, i.e. the voltage and current input by the high-voltage cable, can be adjusted according to the distance between the conveying roller 31 and the discharge roller, as long as it can reliably corona treat the surface of the material strip 20.

[0068] Please see Figure 3 and Figure 4 In some alternative embodiments, the surface treatment apparatus 3 further includes a base 33, to which the discharge roller is connected, the base 33 having a degree of freedom of movement toward or away from the conveyor roller 31, and / or, the discharge roller being movable relative to the base 33 toward or away from the conveyor roller 31.

[0069] By connecting the discharge roller to the base 33, the distance between the conveyor roller 31 and the discharge roller can be adjusted by moving the discharge roller via the base 33 and / or moving the discharge roller relative to the base 33, thereby achieving a better corona treatment effect. Furthermore, this allows the surface treatment equipment 3 to be adapted to corona treatment of different models and sizes of material strips 20, improving its applicability.

[0070] Optionally, the surface treatment equipment 3 also includes a linear drive mechanism, such as a linear servo motor or an electric push rod. The output end of the linear drive mechanism is connected to the base 33 and is used to drive the base 33 to move. In addition, a guide groove may be provided on the base 33, and the discharge roller is connected in the guide groove and can be slidably disposed relative to the guide groove, thereby adjusting the distance between the discharge roller and the conveying roller 31 to achieve corona discharge on the surface of the material strip 20.

[0071] In some alternative embodiments, the base 33 includes a plurality of walls defining a receiving cavity with an opening on one side, the discharge roller being disposed in the receiving cavity and disposed opposite to the conveying roller 31 through the opening, and the air extraction device 34 being connected to the wall and communicating with the receiving cavity.

[0072] Since ozone with an odor is generated during the corona discharge process, by placing the discharge roller inside the receiving cavity and connecting the suction device 34 to the receiving cavity, the ozone can be removed by the suction device 34, thereby reducing the damage caused by ozone to the human body, machinery and equipment.

[0073] Optionally, the multiple walls include a bottom wall 333 and multiple first side walls 331 and second side walls 332 connected and enclosing a receiving cavity. The discharge roller is connected to the first side wall 331, and the first side wall 331 is configured as an insulator to improve the reliability of the base 33. The second side wall 332 serves as a windbreak and can extend at least partially to both sides of the corona channel to reduce ozone leakage. An exhaust device 34 is disposed on the bottom wall 333 and communicates with the receiving cavity, thereby facilitating the removal of ozone and improving reliability.

[0074] Please see Figure 3 and Figure 4 In some alternative embodiments, the axis of the discharge roller is parallel to the axis of the conveyor roller 31. By aligning the axis of the discharge roller with the axis of the conveyor roller 31, the parallelism between the discharge roller and the conveyor roller 31 can be improved, thereby ensuring that the distance between each region on the conveyor roller 31 and the discharge roller is the same along the axial direction of the conveyor roller 31. This improves the uniformity of corona discharge in each region of the material belt 20, facilitates distance adjustment, and enhances the corona discharge effect.

[0075] In some alternative embodiments, the diameter of the conveyor roller 31 is greater than or equal to the diameter of the discharge roller. Since the conveyor roller 31 is used to convey the material belt 20, its diameter can be increased to increase the contact area between the conveyor roller 31 and the material belt 20 while maintaining the same wrap angle. This facilitates stable and reliable transport of the material belt 20 and reduces the bending degree of the material belt 20 during transport, thereby minimizing damage to the material belt 20. The diameter of the conveyor roller 31 can be adjusted according to the material belt 20 to be conveyed, as long as it meets the conveying requirements of the material belt 20.

[0076] Since there are multiple material conveying mechanisms 1 in the battery production equipment 10, namely anode conveying mechanism 1a, cathode conveying mechanism 1b and diaphragm conveying mechanism 1c, in the embodiments of this application, at least one material conveying mechanism 1 is provided with a surface treatment device 3.

[0077] The fact that at least one material conveying mechanism 1 is provided with a surface treatment device 3 means that the surface treatment device 3 may be provided on only one of the anode conveying mechanism 1a, the cathode conveying mechanism 1b and the diaphragm conveying mechanism 1c, or it may be provided on at least two of the anode conveying mechanism 1a, the cathode conveying mechanism 1b and the diaphragm conveying mechanism 1c, so as to roughen the surface of at least two of the anode unit 210, the cathode unit 220 and the diaphragm 230, thereby improving the composite effect of the formed composite material belt.

[0078] Optionally, when the surface treatment device 3 is only installed on one of the anode conveying mechanism 1a, the cathode conveying mechanism 1b, and the diaphragm conveying mechanism 1c, the surface treatment device 3 can be installed on the diaphragm conveying mechanism 1c. Since the anode unit 210 and the cathode unit 220 are coated with slurry, a relatively dense surface is formed after drying. Therefore, compared with roughening the anode unit 210 and the cathode unit 220, by installing the surface treatment device 3 on the isolation conveying mechanism, the surface adhesion of the diaphragm 230 is significantly improved after surface treatment, thereby achieving a better composite effect while saving costs.

[0079] In some optional embodiments, each conveyor belt 1 is provided with a surface treatment device 3, that is, the surface treatment device 3 can be provided on the anode conveyor 1a, the cathode conveyor 1b and the diaphragm conveyor 1c to simultaneously increase the surface roughness on the anode unit 210, the cathode unit 220 and the diaphragm 230, and further improve the composite effect of the composite conveyor belt.

[0080] In some alternative embodiments, at least one conveyor belt 1 is provided with a plurality of surface treatment devices 3, which are respectively used to roughen the surfaces on both sides of the conveyor belt 20.

[0081] Taking diaphragm 230 as an example, diaphragm 230 includes a first surface for composite with anode unit 210 and a second surface for composite with cathode unit 220. Therefore, for diaphragm 230, diaphragm conveying mechanism 1c may be provided with a surface treatment device 3 to roughen one of the first surface and the second surface, or diaphragm conveying mechanism 1c may be provided with multiple surface treatment devices 3, which are respectively used to roughen the first surface and the second surface of diaphragm 230.

[0082] Optionally, for the diaphragm 230, when the diaphragm conveying mechanism 1c is provided with a surface treatment device 3, the surface treatment device 3 can be used to roughen the first surface of the diaphragm 230 to increase the composite effect between the diaphragm 230 and the anode unit 210.

[0083] For the diaphragm 230, the diaphragm conveying mechanism 1c can also be equipped with multiple surface treatment devices 3, for example, two surface treatment devices 3 can be provided. The material belt 20 passes through the two surface treatment devices 3 in sequence to roughen the first and second surfaces of the diaphragm 230, thereby simultaneously increasing the composite effect between the diaphragm 230 and the anode unit 210, as well as between the diaphragm 230 and the cathode unit 220. Under the premise of reducing the risk of edge powder shedding of the cathode unit 220 and pore blockage of the diaphragm 230, the composite effect of the composite material belt is further improved.

[0084] Of course, the anode conveying mechanism 1a and the cathode conveying mechanism 1b can also be equipped with multiple surface treatment devices 3. The specific number and location of the surface treatment devices 3 can be adjusted according to the actual structure, as long as they can meet the requirement of roughening the surface of at least one material strip 20.

[0085] In some alternative embodiments, at least two surface treatment devices 3 perform different levels of roughening treatment on the surface of the strip 20.

[0086] The roughening treatment level refers to the surface roughness of the strip 20 after surface treatment. The higher the roughness level, the rougher the surface of the strip 20. By creating a difference in the roughening treatment level formed on the surface of the strip 20 by at least two surface treatment devices 3, the peel force of the composite surface between the separator 230 and the anode unit 210 and the composite surface between the separator 230 and the cathode unit 220 can be differentiated after surface treatment. Specifically, the peel force of the composite surface between the separator 230 and the cathode unit 220 is greater than that of the composite surface between the separator 230 and the anode unit 210. This reduces the risk of lithium plating and other problems in the resulting stacked battery and improves the performance of the stacked battery.

[0087] Optionally, taking the surface treatment equipment 3 using corona treatment to roughen the surface of the strip 20 as an example, the roughening treatment level of the surface of the strip 20 can be different by making the input power of at least two surface treatment equipment 3 different.

[0088] It is understandable that at least two surface treatment devices 3 may perform different roughening levels on the surface of the strip 20. This could be due to differences in the roughening levels performed by the two surface treatment devices 3 on the first and second surfaces of the same separator 230, differences in the roughening levels performed by the surface treatment device 3 corresponding to the anode unit 210 and the cathode unit 220, or differences in the roughening levels performed by the surface treatment device 3 corresponding to the anode unit 210 and the second surface of the separator 230. As long as the peeling force of the composite surface between the separator 230 and the cathode unit 220 is greater than that between the separator 230 and the anode unit 210 after surface treatment, the risk of lithium plating and other problems in the resulting stacked battery can be reduced, thereby improving the performance of the stacked battery.

[0089] For the battery production equipment 10 in this application embodiment, it may be that multiple material conveying mechanisms 1 are all arranged upstream of the composite mechanism 2, and the composite mechanism 2 rolls the material belts 20 conveyed by the multiple material conveying mechanisms 1 together.

[0090] Please see Figures 3 to 5 The composite mechanism 2 may also include a first sub-composite mechanism and a second sub-composite mechanism arranged at intervals. Among the multiple material conveying mechanisms 1, the material conveying mechanism 1 for conveying the anode unit 210 and the diaphragm 230 is located upstream of the first sub-composite mechanism, and the material conveying mechanism 1 for conveying the cathode unit 220 is located between the first sub-composite mechanism and the second sub-composite mechanism.

[0091] The first sub-composite mechanism 2 is used to roll the fed anode unit 210 and diaphragm 230 together. Specifically, the diaphragm 230 includes an upper diaphragm 230 and a lower diaphragm 230, which are respectively disposed on opposite sides of the anode unit 210 to form an anode composite strip, in preparation for the subsequent composite cathode unit 220, so as to separate the anode unit 210 and the cathode unit 220 by the upper diaphragm 230 and the lower diaphragm 230.

[0092] The second sub-composite mechanism 2 is used to roll the fed cathode unit 220 onto the anode composite strip to form an anode-cathode composite strip. Specifically, the cathode unit 220 includes an upper cathode unit and a lower cathode unit. The upper cathode unit is rolled onto the upper separator 230, and the lower cathode unit is rolled onto the lower separator 230. The upper cathode units are spaced apart, and the lower cathode units are spaced apart and misaligned with the upper cathode units. In this way, in the stacking mechanism, the anode-cathode composite strips can be stacked in a Z-shape, so that each separator 230 has an anode unit and a cathode unit stacked on both sides, forming a Z-shaped stacked battery.

[0093] It should be noted that the Z-shaped stacked battery refers to a stacked battery formed by Z-shaped folding of the anode and cathode composite strips. The Z-shape does not limit the shape of the stacked battery, but only limits the stacking form of the anode and cathode composite strips. The specific structure of the battery production equipment 10 in this application embodiment will be described below using the Z-shaped battery production equipment 10 as an example.

[0094] The battery production equipment 10 includes an anode conveying mechanism 1a, a cathode conveying mechanism 1b, and a separator conveying mechanism 1c. At least two surface treatment devices 3 are correspondingly installed on the separator conveying mechanism 1c. Each surface treatment device 3 includes a conveying roller 31 and a discharge roller arranged opposite each other with a gap. The conveying roller 31 is grounded, and a potential difference exists between the discharge roller and the conveying roller 31 to form a corona channel within the gap. When the separator 230 enters the corona channel via the conveying roller 31, it undergoes corona treatment, resulting in a roughened membrane surface. After passing through at least two surface treatment devices 3, both sides of the separator conveying mechanism 1c are roughened. This increases the peeling force between the anode unit 210 and the separator 230 when they are pressed into an anode composite strip by the first sub-composite mechanism 2, thus solving the problem of delamination and wrinkling between the anode unit 210 and the separator 230 after composite bonding.

[0095] The anode composite strip and cathode unit 220 are rolled together by the second sub-composite mechanism 2 to form an anode-cathode composite strip. Since the surface of the separator 230 facing away from the anode unit 210 in the anode composite strip is also corona treated, the rolling pressure is reduced by enhancing the composite effect. Under lower rolling pressure, the anode composite strip and cathode unit 220 can be composited, reducing filamentous powder shedding from the cathode unit 220 edges, improving the Hi-pot (high potential test, dielectric withstand voltage) efficiency of the stacked battery, reducing the pore-closing problem of the separator 230 caused by the cutting edges of the cathode unit 220 during the rolling process, and improving the air permeability of the separator 230. After composite bonding, the cathode unit 220 and separator 230 do not detach, warp, or curl.

[0096] The anode and cathode composite strips are conveyed to the stacking mechanism, which can reciprocate in a Z-shape to stack the anode and cathode composite strips. Each layer of separator 230 has an anode unit 210 and a cathode unit 220 stacked on both sides to form a Z-shaped stacked battery. Due to the enhanced composite effect between the anode unit 210 and the separator 230, and between the cathode unit 220 and the separator 230, the strips 20 are tightly bonded. The internal separator 230 of the stacked battery is wrinkle-free, the stacked battery has a neat appearance, and has better performance.

[0097] Please refer to Tables 1 and 2. Verification shows that, under the condition that the peel force standard between the anode and diaphragm 230 is greater than or equal to 0.55N, the rolling pressure of the first sub-composite mechanism 2 is only 0.25MPa to meet the composite requirements. Under the condition that the peel force standard between the cathode diaphragm 230 and diaphragm 230 is greater than or equal to 3.8N, the rolling pressure of the second sub-composite mechanism 2 is only 0.15MPa to meet the composite requirements. This improves the composite effect between the diaphragm 230 and the electrode sheet while reducing the risk of edge powder shedding from the cathode unit 220 and pore blockage in the diaphragm 230.

[0098]

[0099] Table 1. Experimental data on the 230mm peel force between the anode and the diaphragm.

[0100]

[0101] Table 2. Experimental data on the 230mm peel force between the cathode and the diaphragm.

[0102] This application embodiment also provides a battery production line, including the battery production equipment 10 in the above embodiment. Therefore, it can also roughen the surface of the material strip 20 before lamination by the surface treatment equipment 3 during the production of stacked batteries. The adhesion of the surface of the material strip 20 after treatment is enhanced, so there is no need to increase the rolling pressure. Under the premise of reducing the risk of powder falling off the edge of the cathode unit 220 and the pore blockage of the separator 230, the lamination effect between the material strips 20 is improved, so that the material strips 20 are tightly bonded, improving the performance of the stacked battery, and thus improving the battery performance.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery manufacturing equipment, characterized in that, include: A material conveying mechanism for supplying and conveying a material belt, the material belt comprising one of an anode unit, a cathode unit, and a diaphragm; A composite mechanism is disposed downstream of the conveyor belt mechanism. The composite mechanism is used to thermally bond the anode unit and the cathode unit to both sides of the diaphragm to form a composite conveyor belt. A stacking mechanism is disposed downstream of the composite mechanism to stack the composite strip; A surface treatment device is disposed upstream of the composite mechanism, and the surface treatment device is configured to roughen the surface of the strip prior to thermal bonding.

2. The battery production equipment according to claim 1, characterized in that, The surface treatment equipment includes a conveyor roller and a processing component arranged opposite each other and having a gap between them. The processing component is configured to roughen the surface of the strip entering the gap, and the conveyor roller is configured to convey the roughened strip to the side where the composite mechanism is located.

3. The battery production equipment according to claim 2, characterized in that, The conveying roller is grounded, and the processing component is a discharge roller. The discharge roller is disposed opposite to the conveying roller and has a voltage difference with the conveying roller to form a corona channel in the gap.

4. The battery production equipment according to claim 3, characterized in that, The surface treatment apparatus further includes a base, the discharge roller is connected to the base, the base has a degree of freedom of movement toward or away from the conveying roller, and / or the discharge roller can be moved relative to the base in a direction toward or away from the conveying roller.

5. The battery production equipment according to claim 4, characterized in that, The base includes a plurality of walls that define a receiving cavity with an opening on one side. The discharge roller is disposed in the receiving cavity and is disposed opposite to the conveying roller through the opening. The surface treatment equipment also includes an air extraction device that is connected to the wall and communicates with the receiving cavity.

6. The battery production equipment according to claim 3, characterized in that, The axis of the discharge roller is parallel to the axis of the conveying roller.

7. The battery production equipment according to claim 3, characterized in that, The diameter of the conveying roller is greater than or equal to the diameter of the discharge roller.

8. The battery production equipment according to claim 1, characterized in that, The number of the material conveying mechanism is multiple, and at least one of the material conveying mechanisms is correspondingly provided with the surface treatment equipment.

9. The battery production equipment according to claim 8, characterized in that, Each of the aforementioned material conveying mechanisms is equipped with a corresponding surface treatment device.

10. The battery production equipment according to claim 8, characterized in that, At least one of the conveyor belts is provided with a plurality of surface treatment devices, and the plurality of surface treatment devices are respectively used to roughen the surfaces on both sides of the conveyor belt.

11. The battery production equipment according to claim 9 or 10, characterized in that, The roughening treatment levels performed on the surface of the strip by at least two of the surface treatment devices are different.

12. The battery production equipment according to claim 8, characterized in that, Multiple of the aforementioned conveyor belt mechanisms are located upstream of the composite mechanism; Alternatively, the composite mechanism may include a first sub-composite mechanism and a second sub-composite mechanism spaced apart, wherein among the plurality of material conveying mechanisms, the material conveying mechanism for conveying the anode unit and the diaphragm is located upstream of the first sub-composite mechanism, and the material conveying mechanism for conveying the cathode unit is located between the first sub-composite mechanism and the second sub-composite mechanism.

13. The battery production equipment according to claim 2, characterized in that, The processing unit includes a material chamber and an output port. The material chamber is used to contain coating material, and the output port is connected to the material chamber and configured to spray the coating material onto the surface of the conveyor belt.

14. A battery production line, characterized in that, Includes the battery production equipment as described in any one of claims 1-13 above.

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